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公开(公告)号：US5131011A
公开(公告)日：1992-07-14
申请号：US545308
申请日：1990-06-26
CPC分类号： H04L25/03337
摘要： Non-linear intersymbol interference and noise in a received data signal are corrected through use of a Viterbi detector which estimates the most likely sequence of transmitted data symbols by keeping track of candidate data sequence that are recursively updated, based on likelihood measures which are determined by a signal processor which includes circuits for estimating hypothesized channel outputs in the absence of noise. Non-linear input-output relations are stored in one or more look-up tables which, in a preferred embodiment, are registers that store hypothesized channel output symbols in the absence of noise. The contents of the look-up tables may be modified in response to an error signal representative of the difference of the channel output signal and the look-up table output signal.
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公开(公告)号：US5036524A
公开(公告)日：1991-07-30
申请号：US473251
申请日：1990-01-29
IPC分类号： H03M5/14 , H03M5/06 , H04L25/03 , H04L25/49 , H04L25/497
CPC分类号： H04L25/497 , H04L25/03019
摘要： In a system for transmitting a binary source signal from a data transmitter to a data receiver through a noisy dispersive channel, the data transmitter includes a sliding block encoder which converts the binary source signal at a given symbol rate 1/T into an encoded binary data signal at a symbol rate P/(NT), where P and N are positive integers such that N/P.ltoreq..sup.2 log(3)/2= 0.79248. Since the channel introduces intersymbol interference and noise into the encoded data signal, the data receiver is formed from the cascade of an equalizer, a sampler and a reconstruction circuit which serves to reconstruct the binary source signal at the symbol rate 1/T. The reconstruction circuit includes a detector in a cascade with a decoder having memory the equalizer, sampler and detector are arranged for the detection of a ternary data signal at the symbol rate P/(2NT).
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3.发明授权Adaptive transform encoder for digital image signal in recording/reproducing apparatus 失效用于记录/再现装置中的数字图像信号的自适应变换编码器
公开(公告)号：US5047852A
公开(公告)日：1991-09-10
申请号：US375727
申请日：1989-07-05
申请人： Hiroyuki Hanyu , Nobukazu Doi , Seiichi Mita , Morishi Izumita , Yoshizumi Eto
发明人： Hiroyuki Hanyu , Nobukazu Doi , Seiichi Mita , Morishi Izumita , Yoshizumi Eto
IPC分类号： G06T9/00 , H03M7/30 , H03M7/38 , H04N1/41 , H04N5/926 , H04N19/00 , H04N19/115 , H04N19/126 , H04N19/134 , H04N19/136 , H04N19/14 , H04N19/176 , H04N19/186 , H04N19/189 , H04N19/196 , H04N19/46 , H04N19/59 , H04N19/60 , H04N19/625 , H04N19/70 , H04N19/85
CPC分类号： H04N5/9264 , H04N19/115 , H04N19/124 , H04N19/14 , H04N19/149 , H04N19/154 , H04N19/176 , H04N19/18 , H04N19/184 , H04N19/60 , H04N19/13 , H04N19/146 , H04N19/91
摘要： An adaptive transform encoder can keep a recording rate of a digital signal at a constant level. It comprises a unit for orthogonal-transforming one block of digital input signal, a unit for calculating an activity index of the orthogonal-transformed block, a unit for comparing the activity index of the block with a predetermined reference, a unit for classifying the block to a standard bit class having a predetermined number of bits when the activity index of the block is equal to the reference, classifying the block to a low bit class having a smaller number of bits than the predetermined number of bits of the standard bit class when the activity index of the block is smaller than the reference, and classifying the block to a high bit class having a larger number of bits than the predetermined number of bits of the standard bit class when the activity index is larger than the reference, a quantization unit for quantizing the input signal of the block with the number of bits designated by the bit class, a unit for selecting the block of the low bit class from the quantized blocks, an allocation unit for adding to the selected block of the low bit class the data having more bits than the number of bits of the standard bit class of the block of the quantized high bit class, and an encoder unit for encoding the quantized block signal.
摘要翻译： 自适应变换编码器可以将数字信号的记录速率保持在恒定水平。 它包括用于正交变换一个数字输入信号块的单元，用于计算正交变换块的活动索引的单元，用于将块的活动性指数与预定参考进行比较的单元，用于对块进行分类的单元 当块的活动索引等于参考时，将具有预定比特数的标准比特类分类为具有比标准比特类的预定比特数少的比特数比特的低比特级， 该块的活动指数小于参考值，并且当活动指数大于参考值时，将块分类为具有比标准比特类的预定比特数大的比特数的比特数较大的高比特级，量化 用于通过由位类别指定的比特数量量化块的输入信号的单元，用于从量化块中选择低比特等级的块的单元 分配单元，用于向所选择的低位类别的块添加比量化高位类别的块的标准位类别的位数多的位的数据，以及用于对量化块信号进行编码的编码器单元 。
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4.发明授权Method of magnetically recording coded digital video signals and an apparatus therefor 失效磁记录编码数字视频信号的方法及其装置
公开(公告)号：US4670797A
公开(公告)日：1987-06-02
申请号：US702600
申请日：1985-02-19
申请人： Masuo Umenoto , Seiichi Mita , Morishi Izumita , Yuuichi Michikawa , Morito Rokuda , Hitoshi Katayama , Hidehiro Kanada
发明人： Masuo Umenoto , Seiichi Mita , Morishi Izumita , Yuuichi Michikawa , Morito Rokuda , Hitoshi Katayama , Hidehiro Kanada
CPC分类号： G11B20/1426 , H04N9/804
摘要： An improved 8-8 mpping table system in digitally and magnetically recording video signals. Video signals coded into natural binary codes consisting of 8 bits are converted into different binary codes consisting of 8 bits constituted by patterns in which a continuous number of the 1's or the 0's does not exceed a predetermined number. In these codes, the continuous number of the 1's or the 0's is so limited that a maximum magnetization interval is reduced in magnetically recording the signals. Therefore, erroneous code is prevented from occurring in reproducing the signals.
摘要翻译： 数字和磁记录视频信号的改进的8-8平台系统。 被编码为由8位组成的自然二进制码的视频信号被转换成不同的二进制码，其由8位组成，其中连续数目1或0不超过预定数。 在这些代码中，1或0的连续数被限制为在磁记录信号时最大磁化间隔减小。 因此，防止在再现信号时发生错误的代码。
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公开(公告)号：US4827489A
公开(公告)日：1989-05-02
申请号：US44489
申请日：1987-05-01
申请人： Nobukazu Doi , Hideki Imai , Morishi Izumita , Seiichi Mita , Akira Saito , Hiroto Yamauchi , Mamoru Kaneko , Tetsuya Amano
发明人： Nobukazu Doi , Hideki Imai , Morishi Izumita , Seiichi Mita , Akira Saito , Hiroto Yamauchi , Mamoru Kaneko , Tetsuya Amano
摘要： A device for decoding coded digital signals for every symbol consisting of a plurality of binary signals comprises first circuit for generating a first reliability for every binary signal; hard decided from the received or reproduced signal, in the symbol and second circuit for generating a second reliability for every symbol consisting of n binary signals on the basis of the first reliability, whereby decoding processing e.g. soft decision decoding is effected for every signal, depending on the second reliability.
摘要翻译： 用于对由多个二进制信号组成的每个符号对编码数字信号进行解码的装置包括用于为每个二进制信号产生第一可靠性的第一电路; 在符号和第二电路中根据所接收的或再现的信号硬判决，用于基于第一可靠性为由n个二进制信号组成的每个符号产生第二可靠性，从而解码处理例如。 根据第二可靠性，对每个信号进行软判决解码。
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6.发明授权Method of converting a digital data signal having a first length into a digital data signal having a second length 失效将具有第一长度的数字数据信号转换成具有第二长度的数字数据信号的方法
公开(公告)号：US4730223A
公开(公告)日：1988-03-08
申请号：US742446
申请日：1985-06-07
申请人： Shigeyuki Ikeda , Morishi Izumita , Seiichi Mita
发明人： Shigeyuki Ikeda , Morishi Izumita , Seiichi Mita
CPC分类号： H04N19/184 , H04N5/926
摘要： A method of converting a digital video signal including first words each being composed of N.sub.1 bits into a digital video signal which consists of second words each being composed of N.sub.2 bits (N.sub.2
摘要翻译： 一种将包括由N1位组成的第一个字的数字视频信号转换成数字视频信号的方法，该数字视频信号由每个由N2位组成的第二字组成，其中第二字由N2位组成（N2
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7.发明授权Method of correcting errors of digital signals in the recording and reproduction of digital signals 失效在数字信号的记录和再现中校正数字信号的误差的方法
公开(公告)号：US4661956A
公开(公告)日：1987-04-28
申请号：US703917
申请日：1985-02-21
申请人： Morishi Izumita , Seiichi Mita , Masuo Umemoto , Hidehiro Kanada , Morito Rokuda
发明人： Morishi Izumita , Seiichi Mita , Masuo Umemoto , Hidehiro Kanada , Morito Rokuda
IPC分类号： G06F15/16 , G06F11/10 , G06F12/00 , G06F15/177 , G11B20/18
CPC分类号： G06F11/1076 , G06F11/1008 , G11B20/1833
摘要： Parity bits (check bits) having a relatively high redundancy are added to upper significant bits of a digital signal, and parity bits having a relatively low redundancy, are added to the lower significant bits of the digital signal. The signal and the parity bits are recorded on a recording medium. The position of an error in a data block group of the lower bits reproduced from the recording medium is estimated as existing in a block in which the error is detected by the check of the data block group of the upper bits, and in the blocks preceding and subsequent to the former.This error correction method is most suitable for a recording and reproduction system of digital video signals.
摘要翻译： 具有较高冗余度的奇偶校验位（校验位）被添加到数字信号的高有效位，并且具有较低冗余度的奇偶校验位被添加到数字信号的较低有效位。 信号和奇偶校验位被记录在记录介质上。 从记录介质再现的低位的数据块组中的误差的位置被估计为存在于通过对高位的数据块组的检查检测出错误的块中，以及在前一个块 并在之前。 该纠错方法最适用于数字视频信号的记录和再现系统。
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公开(公告)号：US20050044468A1
公开(公告)日：2005-02-24
申请号：US10922227
申请日：2004-08-18
IPC分类号： G06F11/10 , G11B20/10 , G11B20/18 , H03M13/11 , H03M13/15 , H03M13/27 , H03M13/29 , H03M13/45 , H03M13/00 , G11C29/00
CPC分类号： H03M13/29 , G11B20/10009 , H03M13/1111 , H03M13/1191 , H03M13/1515 , H03M13/2703 , H03M13/3746 , H03M13/45 , H03M13/6343 , H03M13/6505
摘要： In one embodiment, a symbol error correction encoder effects block interleaving on recording data and thereafter performs first error correction encoding on the recording data. Next, a symbol error correction encoder performs encoding on the whole block. A reproducing processing circuit outputs likelihood information of respective bits. A first error correction decoder corrects a random error produced upon recording and reproduction, using the likelihood information. Since it is possible to make an improvement in performance with respect to the random error by repetitive decoding at this time, the post-correction data is returned to the reproducing processing circuit. After the completion of such repetitive processing, the data is digitized and subjected to an error correction in symbol unit by a hard determination, and outputted to a symbol error correction decoder.
摘要翻译： 在一个实施例中，符号纠错编码器在记录数据上实现块交错，并且此后对记录数据执行第一纠错编码。 接下来，符号纠错编码器对整个块执行编码。 再现处理电路输出各位的似然信息。 第一纠错解码器使用似然信息校正记录和再现时产生的随机误差。 由于此时可以通过重复解码对随机误差进行性能改善，所以后校正数据返回到再生处理电路。 在完成这样的重复处理之后，数据被数字化，并通过硬判断进行符号单位的纠错，并将其输出到符号纠错解码器。
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9.发明授权Tape recorder with means for sampling and holding focusing and tracking error signals during discontinuity of tape on surface of rotating drum 失效磁带录音机，用于在旋转鼓表面上的磁带不连续时采样和保持对焦和跟踪误差信号
公开(公告)号：US5090005A
公开(公告)日：1992-02-18
申请号：US428937
申请日：1989-10-30
申请人： Fumio Hara , Seiichi Mita , Morishi Izumita , Hiroyuki Tsuchinaga
发明人： Fumio Hara , Seiichi Mita , Morishi Izumita , Hiroyuki Tsuchinaga
IPC分类号： G11B7/00 , G11B7/003 , G11B7/0055 , G11B7/09
CPC分类号： G11B7/09 , G11B7/0031
摘要： A tape recorder of the present invention comprises a pair of feed and take-up spools for winding a tape as recording media, a rotatable drum rotated to wind and run the tape between the pair of spools over the drum surface helically, a head for recording, reproducing or erasing signals on the tape wound over said drum surface, and control means for controlling the relative positional relationship between the head and the tape wound over the drum surface based on an error signal such that said signals are stably recorded, reproduced or erased along a desired track, the control means having means for holding the error signal during the period in which the tape is discontinued over a drum surface. The value of the error signal at the time immediately before the tape disappears from the drum surface, or the value of the error signal at the time immediately after the tape reappears over the drum surface during the preceding rotation of the drum is used as the error signal to be held, thereby allowing to stably restart the positioning control when the tape reappears over the drum surface.
摘要翻译： 本发明的磁带录音机包括一对用于卷绕磁带作为记录介质的进给卷轴和卷取卷轴，旋转的滚筒旋转以在螺旋状的卷筒表面上的一对卷轴之间卷绕和运行磁带，用于记录的磁头 ，再现或擦除在所述鼓表面上缠绕的磁带上的信号;以及控制装置，用于基于误差信号控制磁头和缠绕在磁鼓表面上的磁带之间的相对位置关系，使得所述信号被稳定地记录，再现或擦除 所述控制装置具有用于在所述磁带在鼓表面上停止的时段期间保持所述误差信号的装置。 在磁带从磁鼓表面消失之前的时刻的误差信号的值，或在磁带的前一个旋转期间磁带重新出现在磁鼓表面之后的时刻的误差信号的值被用作误差 信号被保持，从而当带重新出现在滚筒表面上时，允许稳定地重新启动定位控制。
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公开(公告)号：US4983965A
公开(公告)日：1991-01-08
申请号：US444845
申请日：1989-12-04
申请人： Nobukazu Doi , Morishi Izumita , Seiichi Mita , Yoshizumi Eto
发明人： Nobukazu Doi , Morishi Izumita , Seiichi Mita , Yoshizumi Eto
CPC分类号： H03M5/14
摘要： An original digital signal is converted into either a Miller-squared code signal or a Miller code signal, and undergoes serial-to-parallel conversion to produce n-phase signals (where n is desired to be a positive even number). N-phase virtual demodulated signals are simultaneously generated at clock timing having a period equivalent to 1/n times the period of the transmission clock. Out of the n-phase virtual demodulated signals, n/2 phases are selected to undergo parallel-to-serial conversion, the original digital signal being thus obtained.
摘要翻译： 原始数字信号被转换成米勒平方码信号或米勒码信号，并进行串并转换以产生n相信号（其中n希望为正偶数）。 在具有相当于传输时钟的周期的1 / n倍的周期的时钟定时处同时产生N相虚拟解调信号。 在n相虚拟解调信号中，选择n / 2相进行并行到串行转换，从而获得原始数字信号。
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